-- The Saudi Embassy in the United States said no Saudi appears to have been involved.
"The embassy stresses that there is no evidence, according to U.S. authorities, of involvement of any Saudi national in the bombings," it said Tuesday in a statement.
-- The investigation is inconclusive.
"They thought they had something with the Saudi national, and that evaporated," a senior law enforcement official said. "There's no sense that they have latched onto anybody or any motive."
-- Authorities are asking those who may have video or pictures taken of the scene around the time of the blasts to call city or FBI hot lines.
-- Cities have stepped up security after the attacks, including Washington, New York, Miami, Chicago, Atlanta and Los Angeles.
-- British police said they are reviewing the security plan for the London Marathon scheduled for Sunday. The marathon will observe 30 seconds of silence and is urging runners to wear a black ribbon to mark the Boston tragedy.
-- "Boston is not going to be intimidated by this," said Secretary of State Kerry, a former U.S. senator from Massachusetts, in testimony to the House Foreign Affairs Committee Wednesday. "But we are going to find out who did this. The police work being done is extraordinary. The FBI is remarkable. There is a great deal of forensic evidence. We are hopeful we can bring people to justice."
-- "The Islamic Republic condemns killing of innocent people in U.S. Boston, Pakistan, Afghanistan, Iraq and Syria in equal measure," Iran's Ayatollah Ali Khamenei said Wednesday, according to a report from the country's state-run Press TV.
-- Obama will travel to Boston on Thursday for an 11 a.m. interfaith service dedicated to the victims.
-- Crowds gathered for a vigil on the Boston Common on Tuesday night. They sang songs and lit candles, and some wept.
-- In New York, the Yankees played "Sweet Caroline" during their game against the Arizona Diamondbacks in a tribute to the victims. The Boston Red Sox team has played the Neil Diamond song during its games for the past 15 years.